Locking device for threaded machine elements



22, 1952 F. RYDBERG 2,604,135

LOCKING DEVICE FOR THREADED MACHINE ELEMENTS Filed lay 3, 1948 I n vanfor Fol/(e @zdherg Patented July 22, 1952 STATES .c m YGD'EVICE -i tMACHINE ELEMENTS;

Folke ydberg, Orllro", Sweden- Jamaicans 194.-.seriai. i f2ei4;,

' In Sweden May 1941 I, i

This mventionerelatesitoa locking device for 9 extendssubstantiallyradlly'through r threaded machine elements, particularly .bolts "ingl'2'in-thenut" t1 'aid e and nuts, comprising ahelical spring arrangedactuatedfronrthe outside between the elements and'inserted into an addi-"Normally,unscrewing-of the nut i's pr'eve iited tional thread providedin the external element, by the locking spring 5'. ii-,howev'eria"*forc'e which additional thread extends through part of acting in thedirection of the arrow 13 (Fig. 2) the length of the last named element,the outer is applied to the outwardly bent end ll of the end of thespring being retained in a reces in wire 9, the wire will be turnewithin the thread the external element. 4 and its inner end It) will beforced against the If an effort is made to unscrew such a machine innerend 8 of the locking spring 5 so as to exelement, for instance a lockingnut, unscrewing pand the spring with the result that the nut isprevented due to the fact that the spring will can be unscrewed. becompressed on account of the frictional con- The force acting on the endH of the wire may tact with the bolt so as to lock the nut to the bolt.be applied manually, such as by a finger, or by Locking devices of thekind referred to suffer means of a suitable tool. generally from theinconvenience that the nut In Figs. 1, 2 and 3 there is illustrated anexcannot be unscrewed from the bolt without the ample of such a tool forexerting a turning spring becoming damaged and incapable of bemovementon the wire and consisting of a hexaging used once more. Consequently, afresh onal sleeve l4 adapted to be axially slid onto spring is requiredevery time when the locking the nut 2. The sleeve has an oblique recessl6. nut has been unscrewed. The face [5 of this recess will turn thewire 9 The invention has for its object to provide a in ananti-clockwise direction as viewed in Fig. device by means of which thenut can be readily 2 and thereby force the end in of the wire againstunscrewed without the locking spring, nut or the end 8 of the lockingspring. bolt being damaged so that the locking device The sleeve l4 maybe formed as a socketmay be used w h any alteration s many wrench havinga recess Hi. It will be obvious times as desired. I attain this objectby mechthat a single sleeve M or similar member can be anism describedbelow with reference to the anused for n t having t Same pan of jawnexed draw g in w ch 1 i a longitudinal If it is not desired to have theouter end of section of a loclsing devic a r g to t the wire extendoutside the nut as shown in Figs. v 2 IS a p Vi w of the device, the land 2, the wire may be shortened as illustrated bolt a d the locking p gbeing Omitted; in Fig. 4 in which the end of the wire is indicated 3shows to a reduced scale a sleeve adapted to at Ha. In this case, arecess I1 is provided in be mounted on the nut to facilitate unscrewing,the nut 2a. The sleeve or similar tool Ma has an and Fig. 4 shows partof a sectional view of a internal projection l8 provided with an obliquemodified embodiment of Such a Sleeve face l9 which when the sleeve Ma.is slid onto Referring to the dr w n eral 1 ind the nut will cause thesame turning movement cates a threaded bolt and numeral 2 a nutof thewire 91 as in the previous embodiment. screwed onto the bolt. The nuthas a thread 3 T Sleeve 14 or Ma, h ld b dimensioned fitting the boltthread, and an additional thread 40 such as t be l t be engaged bywrench or 4 of greater diameter. The additional thread spanner ofstandard type. extends over a portion only of the length of the In theabove description it is assumed that the nut. bolt and nut are providedwith right-handed In the thread 4 18 inserted a helical locking threads.If the threads are left-handed, the dispring 5 the outer end 6 of whichis retained in a 5 rection of the movements will be opposite to radialgroove 1 provided in the nut 2. The inner those indicated above.

end of the locking spring is indicated at 8. What I claim is:

Below the locking spring 5 there is provided a I. In combination, afirst machine element havwire 9 preferably consisting of resilientmaterial ing an external screw thread, a second machine and extending inthe additional thread 4 through so element having a fi s i ernal screwthread conan angle of at least 180. The inner end ll! of structed andarranged to fit said external screw the wire 9 is normally located ataslight distance hread and a second continuous internal screw from theinner end 8 of the locking spring or may thread having a greaterdiameter than said first normally contact the end 8 without exerting ainternal thread and forming a coaxial continuapressure thereon. Theouter end ll of the wire tion thereof, said second element having agroove slight radial other end of said spring. 7 being bent 5 2. Amachine element as described in claim 1.

e other end wherein the sleeve has the same configuration as '11 saidsecond the nut. v V V m said flrstin- V F onK R x DisERG. tiallyelongated t a j n 10 REFERENCES CITED Second in lj al The followingreferences are of record in the n f aid spil in file of this patent: eof more an bread th te UNITED STATES PATENTS 'ng through said 15 NumberName Date 900,589 Ratclifi'e Oct. 6, 1908 926,517 Terry June 29, 19091,189,081 Fitzgerald June 27, 1916 1,630,958 Mauchr May 31, 19271FOREIGN PATENTS Number n Country 8 Date 0 899,690 'France June 7, 1945

